Improvement in harrows



UNITED PATENT FFIGE.

DAVID COUCH, OF NOBLESTOWN, PENNSYLVANIA.

IMPROVEMENT IN HARROWS.

Specification forming part of Letters Patent No. 186,805, dated January30, 1877; application filed July l l, 1876.

To all whom it may concern:

Be it known that 1, DAVID COUCH, of Noblestown, Allegheny county, Stateof Pennsylvania, have invented certain Improvements in Harrows, of whichthe following is a specification:

The object of my invention is to provide for a device for the adjustingof a harrow so as to make it longer or wider, as may be required.

My invention consists in hinging together the ends of the four parts ofa harrow, as hereinafter described. To one of these hinges orconnections I adjust, by aid of one of the teethof the harrow, a swivelor clamp, for the purpose of hitching the draft-animals to the harrow.The upper rear end of this swivel terminates in an eye, in which isfastened a chain. By aid of a hook attached to the top of a bolt, whichacts as a pivot for the opposite hinge of the barrow-frame, I am enabledto stretch the chain over the top of the harrow, and make the harrowlonger or wider instantaneously, as maybe required, by shifting thelinks of the chain in the hook.

In order to describe my invention more fully, I refer to theaccompanying drawing, forming a part of this specification.

Figure I is a top view ofmy adjustable harrow. Fig. II is a front View,and Fig. III is a back view, of the same.

A A are the four parts of the frame. B B are the teeth. O O are hingesbolted to the sides of A A. d and 6 represent the slotted and tenonedends of the frame, forming a hinge by aid of the harrow-teeth B, actingas a pivot ur axle. f and 9 represent the oppo site dovetailed ends ofthe frame, also forming a hinge by aid of the bolt H, acting as-a pivot.I is the swivel or clamp by which the harrow is hitched to the harnessof the draftanimals, terminating in the eye m, to which the chain N isfastened. p is the hook, fastened to the bolt H, by aid of which thechain is shortened and lengthened, adjusting the harrow as may bedesired.

Having thus described my invention, I claim The forward bars of thebarrow, hinged together on a vertical pin, and the hinder bars hinged inlike manner, said pairs of bars having lateral expansion andcontraction, in combination with the adjusting-chain N and linkjomts OO, as and for the purpose specified.

DAVID COUCH.

Witnesses:

GEO. K. RoBB, W. MCOLEAN.

